Uniform-release triple-valve device.



W. V. TURNER.

UNIFORM RELEASE TRIPLE VALVE DEVICE.

APPLICATION IILED JULY22,1907.

1 055 373 Patented Mar.11,1913

WITNESSES INVENTOR mm KM UNITED STATES PA.

ENT OFFICE.

WALTER V. TURNER, OF EDGEWOOD, PENNSYLVANTA, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

UNIFORM-RELEASE TRIPLE-VALVE DEVICE.

Specification of L etters Patent.

Patented Mar. 11, 1913.

Application filed July 22, 1907. Serial No. 885,013.

To all whom it may concern Be it known that I, WALTER V. TURNER, a citizen of the United States, residing at Edgewood, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Uniform-Release Triple-Valve Devices, of which the following is a specification.

This invention relates in general to fluid pressure brakes and more particularly to triple valve devices therefor.

In order to effect a substantially uniform or simultaneous release of the brakes on long trains, it has been proposed to retard the release of the brakes at the forward end of the train. A construction adapted for this purpose is disclosed in ny Patent No. 920,504 of May 4, 1909, and comprises a valve for controlling the brake cylinder exhaust port, havin a full "release position and a retarded release position in which the exhaust opening is restricted, an actuatingpiston for the valve, operatedby an increase in train pie pressurelfor moving the valve from ful release to retarded release posi tion, and a yielding resistance means acting directly against the valve to oppose this movement and for returning the valve to I full release position upon equa ization of thefiuid pressure. In this con action, as the piston moves the valve inwardly to the retarded release position, the yielding resistance spring necessarily opposes the movement of the valve, and acts directly upon the end of same, so that counter strains are set up in the valve, which tend to tip or lift the valve from its seat. I

The principal object of my invention is to provide a yielding resistance means adapted to directly oppose the inward movement of the piston to the retarded release position,

but which does not oppose the tree inward movemcntof the valve, so that no strains are produced in the valve tending to tip or lift thesame from its seat. he resistance means bein adapted to return the valve and piston to ull release position on equalization of pressures thereon,

Another object of m invention is to provide improved means or governing the recharging of the auxiliary reservoir in full release and retarded release positions.

In the accompanying drawings; Figure 1 is a central sectional view of a triple valve device embodying my improvements, with 755 the parts infull release position, and Fig.

2 a similar view, in part, showing the parts in retarded release position.

As shown in the drawing, the triple valve device comprises a casing 1, having piston 80 chamber 2, containing piston 4, valve chamher 3, containing main slide valve 5 and graduating valve 6. The main slide valve 18 provided with exhaust cavity 7, for conneeting brake cylinder port 21 with exhaust port 22, in normal full release position, and having a restricted port 8, which re sters with the exhaust port 22 in the retar ed re-. lease position, all of which is similar to the prior construction. The yielding resistance device comprises a' stem 9, mounted in guide bearings 11 and 12 in a cap 10, which may be secured to the auxiliary reservoir end of the triple valve casing 1. A resistance spring 13 is mounted on the stem 9 intermediate the bearing'll and a collar 14 on the stem 9, and tends to force the stem outivardly to a position limited by the collar 14, engaging a fixed abutment. The outer end of the stem 9 is adapted to bear on the piston stem 15, of the piston 4, and is also provided with a projection 16 which at certain times enga 'es the inner end of the main slide valve 5. T e projectionlti is of such length as to permit of a slight clearance between the pis- 35 ton and the valve, when the resistance stem is in contact with the end of the piston stem 15 and-the valve 5. Thus it will be seen that in the traverse of the parts between full release position and retarded release osition, there will be a slight movement 0 the resistance device and piston relative to the' main valve. Consequently, by reason of the sli ht clearance in the a ove traverse, the va ve is i opposed and free in its movement and the to dency to lift or tip is obviated.

In addition to the usual feed groove around the triple valve piston, I may rovide a through port 17 in the main s ide valve, which registers in full release position with a port and passage 18 leading to the emergency check valve chamber 20, for quickly recharging the auxiliary reservoir in full release position, and a restricted port 19, adapted to register with said port- 18 1015 having a normal full release position and a retarded release position for restricting the exhaust, and a yielding resistance means acting directly against the piston or stem to oppose the movement of the same to the retarded release position.

2. A triple valve device comprising a main valve controlling the brake cylinder exhaust, a graduating valve and piston for operating same, having a movement relative'to the main valve, said mainivalve having a. normal full release position and a retarded release position for restricting the exhaust, and a yielding resistance means acting directly against the piston or stem to oppose the movement of the same to the retarded release position and acting directly upon the main valve to return the same from retarded to normal or full release position.

i 3. A triple valve device comprising a main valve controlling the brake cylinder exhaust, a graduating valve and piston for operating same, having a movement rela tive to the main valve, saidv main valve having a normal full release position and retarded release position for. restricting the exhaust, and a yielding resistance means acting directly against the piston orstem to oppose the movement of the same from the normal to the retarded. release position, the main valve being freefrom the action of the resistance means during this movement.

4. A triple valve device comprising a main valve controlling the brake cylinder exhaust, a graduating valve and piston for operating same, having a movement relative to the main valve, said main valve hav- "m y hand.

possess normal. full release position and a retarded.

release position for restricting the exhaust, and yielding resistance means for returning 1 said valve and piston from retarded to full release position, said piston and resistance means having a movement relative to said valve in their traverse between said positi'ons.

(3. in a fluid pressure brake, the combination with a train pipe, brake cylinder, and auxiliary reservoir, oi a valve for controlling the brake cylinder exhaust port and having a normal full release position and a retarded. release position, and having a port for admitting fluid from the train pipe to the auxiliary reservoirin one position, and a restricted port for admitting fluid from the train pipe to the auxiliary reservoir in the other position.

7. ln a fluid pressure brake, the combination with a train pipe, a brake cylinder, and auxiliary reservoir, of a valve for controlling the brake cylinder exhaust port and having a normal full release position and a retarded release position, and having aport tor admitting fluid from the train pipe to the auxiliary reservoir in full release position, and a restricted port for admit-ting fluid from the train pipe to the auxiliary reservoir, in the retarded release position.

In testimony whereof I have hereunto set WAL"ER V. TURNER. Witnesses R. F. EMERY,

Eni'rn. B. MAoDonALn. 

